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markrohr's Main System |
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| Last Update: October 16, 2006 at 10:19:30 | IP Address: 66.30.248.240 |
| Amplifier: | Adcom GFA-5300, pooged. Home-built all-discrete SS headphone amp with overkill power supply. AMC 3020 integrated for rear channels. |
| Preamplifier (or None if Integrated): | Home-built all-discrete SS. Design stolen from a Harman Kardon schematic but implemented with very high quality parts. |
| Speakers: | Home-built medium-size two-way sealed-box speakers, bi-wired. Birch ply cabs, Vifa PL18WO-09-08 6-1/2' paper-cone woofs, Scan-Speak D2905/9500 1' cloth-dome tweets. 1st-order crossover using Hovland MusicCaps and Solen 14g Perfect Lay inductors. Zobel network. Slightly over-damped bass, Q = about .63 Sub: Parts Express Dayton 10' Titanic. Surround speakers: RA Labs Mini-Reference (2-way sealed box, 6-1/2' woofs). Tweeters replaced with 1' Vifa silk-domes, crossovers reworked to suit. |
| Sources: | |
| CD Player/DAC: | Rotel RCD-971, output stage and PS lightly pooged. |
| Turntable/Phono Stage: | AR EB-101 w/stock arm Shure V15 Vx MR. |
| Other Source(s): | Magnum-Dynalab FT11 with modified PS and output stage. Pioneer PDR-609 CD recorder Pioneer RT-701 R-to-R Sony ES-series TC-KA1ESA 3-head cassette deck |
| Other Accessories/Room/Misc.: | |
| Speaker Cables/Interconnects: | Speaker cables: Nordost CinemaFlex in star-quad configuration, two identical bi-wire sets. ICs: Jon Risch DIY twisted-pair-with-shield, Harmonic Technology Precision Link, Monster 850i. |
| Other (Power Conditioner, Racks etc.): | Home-built music surround box: basically a line-level L-R extractor built with premium parts. Very effective with simply-miked recordings. Rear channels are run at a level that is imperceptible unless switched off. APS-8 FM antenna on rotor in attic, RG6-QS downlead. ACI 65Hz first-order high-pass filters in front of power amp. Monster HTS-2000 power filter Jensen Iso-Max isolation transformer between video and audio to resolve ground-loop issue. Speaker Stands: poured-concrete birdbath columns. Speakers fixed with Blu-Tak ($1.79 variety). Rack: custom-made of veneered 3/4' birch plywood, heavily braced. Five shelves, each wide enough for two components. Weight: approx. 1 ton. Grado SR-60 and SR-125 headphones Four Audio Asylum Yo-Yos, strategically placed. (The blue ones sound better.) |
| Tweaks: | DIY isolation via unhappy balls under CDP, TT, and tuner, DIY roller bearings, vibrapods, cones, and other footers sprinkled about freely.
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| Room Comments/Treatments: | Too small and too square. |
| Music Preferences and Comments: | |
| Music Used (Genre/Selections): | Classical, Jazz, Blues, Rock, actually darn near anything except rap. |
| System Goals/Comments: | Natural sounding instruments, good bass, detail without etched treble. |
| System Strengths: | Tone: the system gives a plausible version of the sound of instruments. Relatively smooth bass. Non-fatiguing treble, a smidge rolled-off at the top. The Haffler-type surround gives it a spaciousness that is attractive. |
| System Weaknesses: | Both system and room are too small to do justice to a symphony orchestra in full cry. Not the most dynamic system I've ever heard, nor the most holographic. Lacks polarity switch; I switch at the speaker terminals using banana plugs. |
| Video/HT System: None | |
| Other Interests/Hobbies/Occupation: | classical bass trombone player; low-brass teacher; I also write program notes for symphony orchestras and other clients. Photography (black + white infrared landscapes, mostly)--not enough time for printing these days, must find some. |
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